The following formulas give the enthalpy, when Coal and Methane react with oxygen: C+O2->CO2+394 kJ/mol, 12 gram C gives 44 gram of CO2+394 kJ CH4+ O2->CO2+2H2O+891 kJ/mol, 16 gram CH4 gives 44 gram of CO2+891kJ a) Calculate the heating value of Coal and Methane in MJ/kg and in kWh/kg. b) Calculate the amount of CO2 which is produced per kWh for Coal and Methane. Give it in kg/kWh.
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
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